Pumping unit



May 9, 1933. A. ANDREWS, 1,908,653

PUMPING UNIT Filed Nov. 7, 1931 2 Sheets-Sheet 1 May 9, 1933. A. e.ANDREWS- PUMPING UNIT Filed Nov. 7, 1931 2 Sheets-Sheet 2 Fatented May9, 1933 UNITED STATES PATENT OFFICE PUMPING UNIT Application filedNovember 7, 1931. Serial No. 573,632.

This invention relates to a pumping unit.

An object of the invention is to provide apparatus specially designedfor operating a deep well pump.

Another object of the invention is to provide a pumping unit of suchconstruction that it may be operatively connected to the pump sucker rodby means whereby the rod will be reciprocated on a true vertical line toprevent the side movement of the sucker rod and the consequent frictionof said rod against its stufiing box, thus reducing the wear of the rod.

Another object of the invention resides in the provision of a pumpingunit, of the character described, embodying a toggle lever constructionand means for actuating the levers to impart a reciprocatory movement ofthe pump sucker rod.

Another object of the invention is to provide in a pumping unit, a noveltype of walking beam operatively connected with' the power in a novelmanner.

A still further feature of the invention 5 resides in the provision of anovel means for counterweighting the pump.

With the above and other objects in view the invention has particularrelation to certain novel features of construction, operation andarrangement of parts, an example of which is given in this specificationand illustrated in the accompanying drawings wherein:

Figure 1 shows a side view of the complete unit as operatively connectedto a pump sucker rod. t

Figure 2 shows a plan view partly in section.

Figure 3 shows a front elevati'on'al view, and

Figure .4 shows a horizontal cross sectional view taken on the line 44of Figure 3.

Referring now more particularly to the drawings wherein like numerals ofreference designate similar parts in each of the figures the numeral 1designates a suitable base upstanding from which are the spacedstandards 2, 2 which support the crank shaft bearings 3, 3 in which thecrank shaft 4 is mounted, to rotate. Fixed on the shaft 4 between saidbearings there is a grooved pulley 5 to receive a driving belt or cable,from a suitable power source. It is to be understood that the crankshaft 4 may be driven in any selected manner. Fixed on the inner end ofthe crank shaft 4 is a fly wheel 6 having the eccentric wrist pin 7mounted on which is the cross head 8, which runs in the track 9, of thepivotally mounted walking beam 10.

Secured on the base 1 and upstanding therefrom are the legs 11, 11 whoseupper ends support the outwardly extended U-shaped bracket 12 which ispreferably formed integrally with said legs. The lower ends of the legsare formed with the base flanges 13, 13

having the aligned transverse slots 14, 14 through which the bolts 15,15, which upstands from the base plate 1, extend, the upper ends of saidbolts being threaded to receive the securing nuts 16 thus providing forthe lateral adjustment of the bracket 12. There is an adjusting shaft17, mounted to rotate in suitable bearings in the bracket'12, which hasa hand wheel 18 or other selected means for rotating said shaft. Theshaft 17 is outwardly threaded and on it is mounted thehead 19 which hasa threaded connection therewith. Extending laterally from said head 19there is the'bearing rod 20 on which the outerend of the walking beam 10is pivoted. The outer end of the rod 20 extends through a longitudinalslot 21 in the bracket 12 and has the retaining nut .22 threadedthereon.

It is obvious that as the momentum wheel Suitably secured to the freeendof the walking'beam there'is a casting 23 which is elongatedvertically and whose forward face 24, is arcuate and is provided withthe vertical grooves 25, 25. may be mounted upon the upper end of this Acounterweight as 26 casting and secured thereon in any selected manner.This counterweight is formed of sections and by the addition or removalof a section or sections of the counterweight its influence incounterweighting the pump may be varied. There are the additionaladjustable, segmental, counterweights 27, 27 whose lower ends arepivotally mounted on a cross bolt 28 which extends through the lower endof the casting 23 and whose outer ends are threaded to receive theretaining nuts 29, 29. The counterweights 27 are flared upwardly andtheir upper ends have the arcuate slots 30. A cross bolt 31 is fittedthrough a suitable bearing in the casting 23 and through the slots 30and one end of which is provided with the head 32 and whose other end isthreaded to receive a retaining nut 33. There is a cross yoke 34pivotally mounted between the upper ends of the weights 27 and anoutwardly threaded adjusting shaft 35 is connected at one end, to saidyoke. This shaft extends through the bearings 36, 36 on the walking beamand between said bearings and threaded on the shaft 35 is the adjustinghand wheel 37. By loosening the nut 33 and by appropriately turning thehand wheel 37 the upper ends of the weights 27 may be adjusted toward orfrom the pump and said weights may be fixed at the selected point ofadjustment by tightening up the nut 33. The counterweighting effect ofthese weights on the pump may be thus varied.

- Over the mouth of the well to be pumped there is a suitable base plate38 upstanding from which are the supporting posts 39, 39 whose upperends support the head plate 40. On this head plate are mounted therotatable sheaves 41, 42. There is a pump sucker rod 43 which extendsdown into the well and whereby the pump is operated. A suitable crossyoke 44 is clamped on the sucker rod by suitable upper and lower clamps45, 45 and the upper toggle levers 46, 46 have their upper ends pivotedto opposite ends of the yoke 44. The lower ends of these upper togglelevers 46 are pivoted to upper ends of the lower toggle levers 47 andthe lower ends of these last mentioned toggle levers are pivoted to thebase plate 38.

There is an operating cable 48 which is looped around the lower end ofthe casting 23 and whose runs work in the grooves 25 and over thesheaves 41, 42. The runs of this operating cable operate around theinner sides of the sheaves 49, 50on the yoke 44 and thence around thesheaves 50-, 51 on the corresponding toggle levers 47 and the free endsof said runs of said cable 48 are attached to the opposite toggle levers47. This attachment is effected through the slidably mounted yokes 52,53 which are mounted on said respective toggle levers 47, and which maybe adjusted thereon by means of the adjusting hand wheels 56. Bysuitablyturning said hand wheels 58 their corresponding yokes may beadjusted and the slack in the corresponding ends of the cable taken upto the end that the tension on the runs of the cable may be maintainedequal.

There is a vertical guide rod 57 on the base 38 and the yoke 44 has abearing 58 which runs on said rod 57. There is a coil spring 59 aroundthe rod 57 and interposed between the bearing 58 and the adjusting nut60 which is threaded onto said rod 57 and by means of which thecompression of the spring 59 may be regulated. This spring serves as ashock absorber upon down stroke of the pump and assists in the upstrokethereof.

In operation as the shaft 4 rotates the Walking beam 10 will beoscillated. Upon down stroke of said walking beam the toggle levers 46,47 will be actuated in an obvious manner to elevate the yoke 47 and thesucker rod 43 thus effecting a power stroke of the pump. At the end ofthe power stroke the sucker rod will move downwardly by gravity, but inthis downward movement will be balanced by the weights 26, 27 to the endthat the sucker rod will not drop too suddenly and the spring 59 alsoacts to retard the downward movement of the sucker rod and to absorb theshock of such downward movement. The weights 26, 27 also assist in thepower stroke of the pump in the usual manner.

A pumping unit of the character described will operate very smoothly,will be capable of developing great lifting power for operating the pumpon power stroke and will operate the sucker rod of the pump on a truevertical line.

The drawings and description disclose what is now considered to be apreferred form of the invention by way of illustration only while thebroad principle of the invention will be defined by the appended claims.

What I claim is:

1. In a pumping unit a yoke adapted to be connected to a pump rod andhaving a bearing, toggle levers connected to said yoke and operable toelevate, and to permit the lowering of, said yoke and the rod to whichthe yoke is connected, a fixed, vertical guide rod on which said bearingruns and forming guide means for said yoke for guiding the samevertically.

2. In a pumping unit a yoke adapted to be connected to a pump rod andhaving a bearing, toggle levers connected to said yoke and operable toelevate, and to permit the lowering of, said yoke, and the rod to whichthe yoke is connected, a fixed guide rod on which the bearing works forsaid yoke for guiding the same vertically, and a resilient member aroundsaid rod on which the yoke is supported.

3. A pumping apparatus comprising a pivotally mounted walking beam,means for oscillating said beam,'means for bodily adjusting said beamrelative to said oscillating means, series of toggle levers, meansforconnecting said levers to a vertically reciprocable pump rod, aflexible member operably connecting said beam to said levers ,wherebythe levers may be actuated to lift, and to permit the descent of, saidrod.

4. A pumping apparatus comprising a walking'kbeam pivoted at one end, anadjustable counter balancing weight supported on the other end of saidbeam, means for adjusting said weight relative to. said beam, a systemof operating levers, means for connecting said levers to a verticallyreciprocable pump rod, and a flexible operating member conmeeting saidbeam to said levers.

5. A pumping apparatus comprising a walking beam, supporting means onwhich thevbeam is pivoted to oscillate vertically, means for connectingsaid beam to a vertically reciprocable pump rod, whereby the rod may bereciprocated, means connected to the beam-for oscillating the same andmeans for adjusting said beam and. its supporting means, relative tosaid oscillating means whereby the range of movement of the beam may bevaried.

"6. A pumping unit comprising an oscillating beam, an adjustable memberon which the beam is pivotally mounted, a revolving member operativelyconnected with the beam whereby the latter may be oscillated, means forsliding said adjustable member and beam relativeto said revolving memberwhereby the stroke of the beam may be varied, and

means for operatively connecting said beam with the pump to be operated.

7. In a pumping unit, a pivotally mounted walking beam, a counter weightpivoted thereon and means on the beam for swinging said weight intodifferent positions relative to the beam.

8. n a pumping unit a pivotall mounted walking beam, an end castintheibon having an arcuate, grooved, end ace, a weight a on said casting,and a weight pivotally mount-- ed on said beam and swingable intodi-fierent positions of adjustment.

9. In a pumping unit a yoke adapted to be connected to the sucker rod ofa pump and having a bearing, toggle levers connected to 1 said yoke,means for actuating the levers to lift said yoke and rod, a guide rodalong which the yoke bearin 'moves, and resilient I 11. In a pumpingunit, a walking beam, a-

In testimony whereof Ihave signed my I I name to this s ecification.

' ALE NDER G. ANDREWS.

means beneath the yo e for cushioning the downward movement of saidsucker rod.

10. In a pumping unit, a walking beam, a bearing rod on which-one end ofthe walking beam is pivoted, a support upon which said bearing rod isslidably molmted, an adjust ing shaft having a threaded connection withsaid bearing rod and rotatable to adjust said rod, means oscillatingsaid beam and means for operatively connecting the beam with the pump tobe operated.

